Activates triple buffering.
This can increase the frame rate in fullscreen mode because it disables synchronization to the monitor frequency (vsync),
more video memory for a third screen buffer, and can produce 'tearing' artifacts
on some systems.
0 - Double buffering (default)
1 - Triple buffering
This variable can only be set in before the first frame in lite-C.
When d3d_triplebuffer is set, any changes in panels or views need 2 frames for becoming visible on the screen (otherwise, 1 frame).
d3d_triplebuffer = 1; // activate Triple Buffering